Transit police say they have arrested an 18-year-old high school student caught on video placing feces on a TriMet bus driver’s seat last week at the Sunset Transit Center.

About a dozen tips from people who saw a photo of the woman on Hard Drive and other websites led police to to Gloria C. Soto, 18, who has been charged with felony criminal mischief and misdemeanor interfering with public transportation.

According to a message to Hard Drive’s Twitter account on Wednesday, Soto is a student at Sunset High School. It remains unclear if the feces was human or dog.

As we first reported last week, someone wiped dog poop all over the steering wheel and operator’s seat of a No. 62 bus while the driver was a taking a break.

The very dirty deed happened Monday night at the Sunset Transit Center. TriMet says the photo was a frame capture from a surveillance camera on board the bus.

“As a reminder to those who commit any crimes on TriMet,” said spokeswoman Mary Fetsch, “TriMet has security cameras at 75 percent of its MAX platforms, on all trains and two-thirds of its buses. When there is an incident, TriMet pulls the video and uses it to prosecute crimes against the agency.”